<template>
  <div class="goods">
    <!-- 左侧menu-wrapper -->
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" class="menu-item" v-bind:class="{'currtent':currentIndex===index}"
            v-on:click="selectMenu(index,$event)">
       <span class="text border-1px">
            <span v-show="item.type>0" class="icon" v-bind:class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <!-- 右侧foods-wrapper -->
    <div class="foods-wrapper" ref="foodsWrapper">
      <!-- 外层商品类别遍历goods -->
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <!-- 类别里的单个商品遍历item.foods -->
          <ul>
            <li v-for="food in item.foods" class="food-item border-1px">
              <div class="icon">
                <img width="57" height="57" v-bind:src="food.icon">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span><span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span><span class="old"
                                                                v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol v-bind:food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <!-- 底部购物车 -->
    <shopcart  v-bind:deliveryPrice="seller.deliveryPrice" v-bind:minPrice="seller.minPrice"
              v-bind:selectFoods="selectFoods"></shopcart>

  </div>

</template>
<script type="text/ecmascript-6">
  import BScroll from 'better-scroll';
  import shopcart from '../shopcart/Shopcart';
  import cartcontrol from '../cartcontrol/Cartcontrol';

  const ERR_OK = 0;
  export default {
    props: {
      seller: {
        type: Object
      }
    },
    data () {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,      //
        selectFood: {}
      };
    },
    created () {
      this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
      this.$http.get('/api/goods').then((response) => {
        response = response.body;
        if (response.errno === ERR_OK) {
          this.goods = response.data;
          this.$nextTick(() => {
            this._initScroll();
            this._calculateHeight();
          });
        }
        ;
      });
    },
    methods: {
      selectMenu (index, event) {
        if (!event._constructed) {
          return;
        }
        ;
        console.log('执行点击啊' + index);
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let el = foodList[index];
        this.foodsScroll.scrollToElement(el, 300);
      },
      _initScroll () {
        this.meunScroll = new BScroll(this.$refs.menuWrapper, {
          click: true
        });
        this.foodsScroll = new BScroll(this.$refs.foodsWrapper, {
          click: true,
          probeType: 3
        });
        this.foodsScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y));
        });
      },
      _calculateHeight () {
        let foodList = this.$refs.foodsWrapper.getElementsByClassName('food-list-hook');
        let height = 0;
        this.listHeight.push(height);
        for (let item of foodList) {
          height += item.clientHeight;
          this.listHeight.push(height);
        }
        ;
      }
    },
    computed: {
      currentIndex () {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (!height2 || (this.scrollY > height1 && this.scrollY < height2)) {
            return i;
          }
          return 0;
        }
      },
      selectFoods () {
        let foods = [];
        this.goods.forEach((item) => {
          item.foods.forEach((food) => {
            if (food.count) {
              foods.push(food);
            }
            ;
          });
        });
        return foods;
      }
    },
    components: {
      'shopcart': shopcart,
      'cartcontrol': cartcontrol
    }
  }
  ;
</script>
<style lang="stylus" rel="stylesheet/stylus">
  @import '../../common/stylus/mixin.styl'
  .goods
    display flex
    position absolute
    width 100%
    top 174px
    bottom 46px
    overflow hidden

    .menu-wrapper
      flex 0 0 80px
      width 80px
      background: #f3f5f7

      .menu-item
        display table
        height 54px
        width 56px
        font-size 12px

        .icon
          display inline-block
          width 12px
          height 12px
          margin-right 2px
          background-repeat no-repeat
          background-size 12px 12px

          &.decrease
            bg-image('decrease_3')

          &.discount
            bg-image('discount_3')

          &.guarantee
            bg-image('guarantee_3')

          &.invoice
            bg-image('invoice_3')

          &.special
            bg-image('special_3')

        .text
          display table-cell
          width: 56px
          vertical-align: middle
          border-1px(rgba(7, 17, 27, 0.1))
          font-size: 12px

    .foods-wrapper
      flex 1

      .title
        font-size 12px
        line-height 26px
        color rgb(147, 153, 159)
        padding-left 14px
        background: #f3f5f7

      .food-item
        display flex
        margin 18px
        padding-bottom 18px
        border-1px(rgba(7, 17, 27, 0.1))

        &:last-child
          border-none()
          margin-bottom 0

        .icon
          flex 0 0 57px
          margin-right 10px

        .content
          flex 1

          .name
            margin 2px 0 8px 0
            line-height 14px
            font-size 14px
            color rgb(7, 17, 27)

          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)

          .desc
            line-height: 12px
            margin-bottom 8px

          .extra
            .count
              margin-right: 12px

          .price
            font-weight 700
            line-height 24px

            .now
              margin-right 8px
              font-size 14px
              color rgb(240, 20, 20)

            .old
              text-decoration line-through
              font-size 10px
              color rgb(147, 153, 159)

          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 12px
</style>
